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| author | Jacob Garber <jgarber1@ualberta.ca> | 2019-07-17 11:47:19 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-08-20 15:30:47 +0000 |
| commit | 293e6a96a9e19812f17bf6f925415e115612f607 (patch) | |
| tree | 16c898c77d69b32bbfa8c56ba8d2cefecf539572 /src/southbridge/amd/sr5650/sr5650.c | |
| parent | 4f387e1240dc05d4eff59ae973ab4516cd588e1f (diff) | |
| download | coreboot-293e6a96a9e19812f17bf6f925415e115612f607.tar.xz | |
nb/amd/pi,sb/amd/sr5650: Remove unnecessary allocation
add_ivrs_device_entries() is a recursive function, and each recursive
call is passed a pointer to a root_level variable declared outside the
function. In an attempt to make the function self-contained, the initial
call is made with the root_level pointer set to NULL, and then the
function attempts to detect this and allocate a root_level variable for
the rest of the calls. This makes memory management very tricky - for
example, the pi code incorrectly attempts to free the root_level
variable at the end of *each* recursive call, which only avoids being a
double-free because free() in coreboot is currently a no-op. Let's
keep life simple and declare root_level as a local variable outside the
first function call instead.
Change-Id: Ifd63ee368fb89345b9b42ccb86cebcca64f32ac8
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1362811
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34387
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/southbridge/amd/sr5650/sr5650.c')
| -rw-r--r-- | src/southbridge/amd/sr5650/sr5650.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/src/southbridge/amd/sr5650/sr5650.c b/src/southbridge/amd/sr5650/sr5650.c index 90ca5641cc..8131e77e5f 100644 --- a/src/southbridge/amd/sr5650/sr5650.c +++ b/src/southbridge/amd/sr5650/sr5650.c @@ -725,13 +725,6 @@ static void add_ivrs_device_entries(struct device *parent, struct device *dev, struct device *sibling; struct bus *link; - if (!root_level) { - root_level = malloc(sizeof(int8_t)); - if (root_level == NULL) - die("Error: Could not allocate a byte!\n"); - *root_level = -1; - } - if ((dev->path.type == DEVICE_PATH_PCI) && (dev->bus->secondary == 0x0) && (dev->path.pci.devfn == 0x0)) *root_level = depth; @@ -798,9 +791,6 @@ static void add_ivrs_device_entries(struct device *parent, struct device *dev, sibling = sibling->sibling) add_ivrs_device_entries(dev, sibling, depth + 1, depth, root_level, current, length); - - if (depth == 0) - free(root_level); } unsigned long acpi_fill_mcfg(unsigned long current) @@ -879,7 +869,8 @@ static unsigned long acpi_fill_ivrs(acpi_ivrs_t *ivrs, unsigned long current) current += 8; /* Describe PCI devices */ - add_ivrs_device_entries(NULL, all_devices, 0, -1, NULL, ¤t, + int8_t root_level = -1; + add_ivrs_device_entries(NULL, all_devices, 0, -1, &root_level, ¤t, &ivrs->ivhd.length); /* Describe IOAPICs */ |